Air-compressor.



C. RORABECK.

AIR COMPRESSOR.

APPLICATION FILED JAN. 2. 1915.

mm m a e D d m m P COLUMBIA PLANOCIRAPH COHWASHI CLAUDE ROEABECK, OFDAYTON, OHIO.

AIR-CO1VIPRESSOB.

Specification of Letters Patent.

Patented Dec. 7, 1915.

Application filed January 2, 1915. Serial No. 129.

To all whom it may concern:

Be it known that I, CLAUDE RORABECK, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented certain new and useful Improvements in Air-Compressors; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to whichitappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and.

figures of reference marked thereon, which form a part of thisspecification.

This invention relates to new and useful improvements in air-compressorsof a type adapted to be used in connection with light explosive engines,such as are used for propelling motor boats.

The object of the invention is toprovide a device of this type which issimple in construction, safe and eflicient in operation and in which theexcess pressure generated is cared for in a simple manner.

Referring to the accompanying drawings, Figure l is a longitudinalvertical section through the cylinder of the compressor; Fig. 2 is asection on the line a-a of Fig. 1; Fig. 3 is a section on the line 6-?)of Fig. 1.

In the specification and drawings, similar reference charactersdesignate corresponding parts both in the description and drawings.

Referring more particularly to the drawings, 1 represents anair-compressor cylinder provided with a'face 2 by means of which saidair-compressor may be conveniently attached to any suitable support.Mounted within said cylinder 1 is a compressor piston 3 which isprovided with packing-rings 4 and is connected with an eccentric orcrank (not shown) by a con necting rod 5 in a well known manner. Theconnecting rod 5 is coupled to the piston by a wrist-pin 6 and thepiston 3 is further provided with oil grooves 7 Which' are well knownlubricating means. The oil for lubricating the piston is suppliedthereto through a port 8. The cylinder is further provided with airinlet ports 9 which are exposed when the piston 3 reaches the lower endof its stroke, the said piston drawing a partial vacuum during itssuction stroke. During the upward movement of said piston, the air inthe cylinder previously drawn in through ports 9 is compressed in theupper end thereof beneath the cylinder head 10 and is discharged fromsaid cylinder through a cylindrical valve 11 mounted in a boss 12 andprovided with an exhaust pipe 13. The seating end of said valve 11 is ofconical form and cooperates with a correspondingly formed seat. The saidvalve is under the control of a spring 1-1 the tension of which may beregulated by a cap 15 mounted in the boss 12. The pipe 13 leads to asuitable reservoir (not shown) and when the pressure in the reservoirbecomes excessive or when the pipe 13 is shut off, the air compressed inthe cylinder 1 is discharged past a relief valve 16 of similarconstruction. The valve 16 is mounted in a boss 17 in the cylinder head10 and is provided with a discharge port 18 which is open to theatmosphere. The said relief valve is further provided with a spring 19the tension of which may be adiusted by a cap 20 mounted in the upperend of the boss 17. The aircompressor so constructed and arranged issimple and efficient and reduces to a minimum trouble experienced withthe handling of the air under compression. It further eliminates thepossibility of injury or breakage of parts due to overpressure.

Having described my invention, I claim.

In an air compressor, the combination of a cvlinder having air intakeports in the side of the compression end thereof, and a pistoncooperating therewith, of a solid casting mounted on the compression endof said cylinder and forming the head thereof, said head having twouniform openings extending verticallv therethrough and having internalthreads in the outer ends thereof and terminating at their inner ends invalve seats which communicate with the compression end of the cylinder,and lateral discharge openings extending from said seats through thesides of said head, a tubular valve mounted in each of said verticalopenings below the internal threads thereof. said valves controlling thedischarge of air from the cylinder at different pressures, a springmounted in each valve and normally con- 2 V 1 ,1e2,ss4

trolling the seating action thereof, and ad- In testimony whereof Iafiix my signajustable capsC1 cflosing said openings above ture, inpresence of two Witnesses. the valves an orming t e outer abutments forthe springs and serving to regulate the CLAUDE RORABECK' 5 tension ofthe springs so that a greater pres- Witnesses:

sure is required to open one of said Valves MEL IE GALLoWAY, than theother. MATTHEW SIEBLER.

. Copies of this patent may be obtained for five cents each, byaddressing the "Commissioner of Patents.

Washington. D. O.

